Geology of the shear-hosted Burnt Timber deposit, Lynn Lake, northern Manitoba

The Burnt Timber gold deposit is located in the Paleoproterozoic Lynn Lake greenstone belt of the Trans-Hudson Orogen, Manitoba. The deposit is in the Johnson shear zone and is hosted in LREE enriched and depleted tholeiitic volcanic arc basalts. epsilonNd values for these basalts range from 3.3 to 4.7, which is typical of rocks of oceanic island arc affinity of this age. The Johnson shear zone is a regional, belt-parallel structure characterized by an intensification of the regional S2 foliation. At the Burnt Timber deposit, S2 is folded by centimeter- to metre-scale, Z-shaped, F3 chevron folds that have an axial-planar S3 crenulation cleavage.; Gold occurs in pyritic, biotitic, chloritic, and carbonatized mafic volcanic rocks along the core of the shear zone. Unmineralized basalts proximal to the deposit are enriched in biotite and contain anomalous molybdenum values. This enrichment in biotite and molybdenum extends the size of the exploration target beyond the mineralized zones and provides a new exploration tool to aid discovers of new gold deposits along the Johnson shear zone. (Abstract shortened by UMI.)...